in Reply Refer Tv; Rf-2-1 W 4686

U n 011 Cc»veuy o f Ca11fo» Av itlon: Wr. L . C. Hebe' SOO .xecutlv . Uza East 4*15 liethu j>t frxmsuy rH*j«teut Texti 77027

Gentl ansae:

Reference 1s sted* t© your Init ial Pie* of F.x^loration received October 21, 19*5,, for Lets* OCS-6 7499, Block 494, Garden Banks Area. This plan Include the activit ies preamed fer Hel i s A, B, aial C.

In accordance with 30 CFR 210.34, revised December 13, 1979, am. our letter dated January 29. 1979 v this plan has heen deterained te be cossplete as of Moveafcer 4, 1965, and Is near be Inf considered for approval.

Your plan cotrtrol uuaaW is N-2329 and should he referenced 1n your cceaauuica-tlon aad corresprnrV^ce concerning this plan.

Sincerely yours.

(Orig. Sgd.) A. Donald Ci,

Acting Regional Supervisor tales oad Production

bcc: Lease OCS-6 7499 (OPS-3-2) (FILE ROOM) t0fS-3-4 w/Puh11c Info. Copy of the plan (PUBLIC RECOROS ROOM)

NJTolbert:bib:10/23/85 Dish 3A

r

I 1

CT!)

Union Oil and Oaa Division: Oulf Region

Union Oil Company of California 500 Executive Plaza East 4615 Southwest Freeway Houston. Texas 77027 Telephone: (713) 621-7600

uni®n uwresu MANAGEMENT SERVICI

October 17, 1985

OCT 21 1985

Minerals Management Service P. O. Box 7966 Metairie, Louisiana 70010

Attention: Mr. D. W. Solanas

RE: Exploratory Plan OCS-3-7499, Block 494 Garden Banks Area Offahore, Texas

Gentlemen:

Encloeed in thia package are seventeen (17) copiea of Onion Oil Company of California's Exploratory Plan outlining the propoaed plan for the subject leaae in accordance with 30 CPR 250-34 and letter OS-7 dated January 29, 1979. Pive (5) of the copies contain proprietary data and are ao marked. One (1) of the copiea containa the high resolution aurvey data required by NTL No. 83-3 paragraph II-A-5.

I f any additional information i a required, pleaae contact Mr. Tony Stewart at (713) 621-7600, extenaion 1142.

Sircerely,

UNION OIL COMPANY OP CALIFORNIA

L. C. Hebert

Diatriet Operatione Manager LCH/mb

PLAN OP EXPLORATION

OCS-G-7 499, BLOCK 494

GARDEN BANKS AREA, OFFSHORE, TEXAS

Union Oil Company of California propoaea to d r i l l three (3) •xploratory wella on the OCS-G-7499, Block 494, Garden Banka Area, Offahore, Texas. D r i l l i n g operations ahould commence in April of 1986 dependent of r i g acheduling. The wella are designed to t e s t any and a l l prospective sands which might exiet to a depth of 14,000' TVD in the Block (See Exhibit No. 1).

Well Data for OCS-G-7499, Block 494 (See Exhibit No. 2)

Well No. Depth (TVD) Location Time (Daya)

A 10,000' 7950' PEL 6 7700' PNL 40

B 10,000' 6000' PEL 6 6000' PNL 40

C 14,000' 7650' PEL 6 3750' PNL 70

I f the exploratory project i a commenced aa planned and the d r i l l i n g program i a continuous, thia project ahould be completed i n 150 daya. whether a l l three (3) wella are d r i l l e d w i l l depend upon the results of the f i r a t wella d r i l l e d .

The wells w i l l be drilled u t i l i s i n g e floater r i g aimilar to the one ahown in Exhibit Ko. 3. The r i g w i l l be a d i e s e l - e l e c t r i c d r i l l i n g unit and equipped with pane or sumps to collect greaae or other pollutants. The liquida w i l l be atored in o i l drums for disposal onahore.

A l l wella d r i l l e d for oil and gaa w i l l be d r i l l e d in accordance with 30 CPR 250.34, the proviaiona of OCS order No. 2 and the stipulationa of the o i l and gaa 1 aae covering thia block. No garbage, untreated sewage or other aolid wastes ahall be disposed from veaaela. A l l aolid combustible waate products w i l l be incinerated, taking great care not to endanger the r i g . A l l non-combustible material w i l l be traneported to ahore for disposal at our Surfside f a c i l i t y .

The drilling operations w i l l be aerviced from Union'a ahore baae located at Surfaide, Texas. Tho f a c i l i t y haa docking f a c i l i t i a a for the marine equipment that w i l l be uaed on thia leeae. There i a a crane for loading and unloading materials. Union maintaina

a amall stock of tubular goods on the pipe racks. There are alao helicopter pads where pereonnel and supplies can be loaded to be -flown to and from the r i g r . The baee ia manned 24-hours per day. Goods and services for the offehore operations are located in the Freeport and Hous; n̂ areas and are eas i ly transported to th i s f a c i l i t y by highway and marine transportation (See Exhibit 4 ) .

Union Oil Company of Cal i fornia hae f i l e d an o i l e p i l l contingency plan with the Minerals Management Service in accordance with OCS Order No. 7. This plan containa the namea and telephone numbers of company personnel who w i l l form an emergency reeponee team in the event of an o i l e p i l l . This plan contains procedures for reporting a s p i l l and for responding to a reported s p i l l . Union Oi l Company of Cal i forn ia i s a member of Clean Gulf Associates. This association providee for the purchase and maintenance of equipment and materiele for use by the members in the clean-up of an o i l e p i l l . Equipment ie preeently located at Galveeton and Freeport, Texas; Cameron, Intracoastal C i t y , Grand I s l e and Venice, Louisiana. Some of the equipment avai lable include a shallow water skimmer ayatem with 40-barrel atorage cepecity, a faat response open eea and bay ayatem with two (2) 180-barrel tanks used in skimming and storing, a high volume open eea skimmer ayatem with 1000-barrel atorage capacity. The amount of time required to get to the s p i l l wi l l vary dependent on the location of company chartered work boata or the a v a i l a b i l i t y and location of work boats for immediate charter . Equipment response time should be within 24 hours of not i f i ce t ion .

Exhibi t No. 5 i s in compliance with the U .S .G .S . Gulf of Mexico l e t t e r 75-8 deted June 1974. This evaluation of bottom d r i l l i n g hazards waa derived from a Multi-sensor Engineering Survey using Sidescan Sonar, Magnometer, and an Acoustic P r o f i l e r of Block 494. Baaed upon presently avai lable geological, geophysical snd ercheological information, there ere no known ehallow d r i l l i n g haserde at the propoeed location of the wel la . A copy of the high-resolution aurvey data from the two l ines closest to the proposed wel l locationa i a included with one copy of the Plan of Exploration aa per Paregraph I I . A . 5 . of NTL No. 83-3.

Other relevant information and data aa required includea the mud component and additive l i a t (Exhibit 6) and the Air Quality Statement (Exhibit 7 ) .

V-9,979,200.00'

UNION

OCS-G-7499

S

PTD 14.000 '

494

7980'

PTD 10.000' 8000

PTD 10.000' r-7980'

V-0.963. 360,00

EXHIBIT #2

G**»4tC tCmlt

UNION OIL AND OAS DIVISION UNION OIL co or CAkiromiiA TCRAt orrtNOM DISTRICT

GARDEN BANKS BLOCK 494 OFFSHORE TEXAS raorous LOCATIONS

A.B.4 C

m m i a n n i P I C l A M t u m I H . I 1 1 / 5 I .

i • • TYPICAL SLMI-SUBMERSIBLE

RIG DESCRIPTION Lowe* HuMs: Length ovtr all 260" 0" Beam 53-4" Depth 25 -0" Max. Beam (OA) 203 -4 -Caisaona: Comer 38 -0" Dia Center 35 -0" Dia Baseline to: Main Elev. Dk 116-0" Pipe Rack 132 -0" Heliport 136-0" Drill Floor 150 -0" Spider Deck 106 -6" Main Dk 220' Long x 202' Wide

65 -0" Operating Draft 50 -0" Survival Draft 23 -0 ' Transit Draft

EXHIBIT No. 3

• jsr*

a

5 T TTT

MAIN DECK

• G O V

• O - i ^ M I D ' —

ft L A T A M M M I *V»i« {5tM> PIN _ | |

I COM* § c " . i i c » »

I O » CO*.'**. *v • « — - - — . *

• 0 * MOkl

i! r

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/ MUO »Utt» * 0 O V

T ~ C M * « O 4 » > 0 ' MHUftG H / M » . • J M pv

row** •*>CKI ' M l - » s •

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« M l D t * » » C0»»'»0.

CO**©.! » t

MACMINFPV OECK

EXHIBIT No. 3A

E X H I B I T NO. 3B

DRILLING A WORKOVER EOUIPMENT OrswworttS' Continental Emsco C-3, Type II, V W drill line driven by

two 800 hp electric motors. Derrick: Nominal hood load capacity 1,000.000 pounds Substructure: Capacity of simultaneous 1,000.000 hook load plus; 500.000 setback Rotary a Traveling Equipment: Continental Emsco 49-Vi" rotary Continental Emsco RA-60-6 six sheave block BJ. "5000" hook Continental Emsco LB-500 swivel Mud Pumps Two Continental Emsco FB-1600 triplex pumps each

driven by two 600 hp electric motors. w IPJIPB i n u f f o .

Two EMD 16645-E8 1575 KW rated 22l0 hp each Two EMD 12-E6 1180 KW rated 1650 eech Ditfllf ty Equipment Motors: Seven 800 hp DC electric motors Blow Out Preventers (Trimmed for Hfi Service): Two double ram 18 " 10,000 lbs. WP Shaffer type "SL"

hydraulic operated double blow out preventer, 18%" vertical bore, complete with stainless steel lined ring grooves

Two 18%" 5,000 lbs. WP Sf .after spherical blow out preventer. 18%" vertical bore, complete with stain­less steel r ied ring grooves.

Choke Manifold: Two hand adjustable chokes One full flow One super adjustable All trimmed for Hfi service Tonsionors: Four twin 160,000 Ib. rioer tensioners Six 16,000 Ib. guideline tensioners Mud Mixing: Three 6" x 8" pumps -1,000 GPM eech

One desilter with fourteen 4" cones One desander with three 12" cones Air Compressors: Three eech driven by 100 hp, 1800 rpm motors snd rated

St 920 CFM. One diesel compressor for cold atari

DrBJ Pipe: lO.OOO" of 5" O.D. X-bokt Grade "E" 5,000 Of 5" O.D. X-hole Grade "G"

Miscellaneous: Cementing Unit HOWCO HT-400 Power Tongs Lamb Hydraulic Kelly Spinner Varco 6500 Logging Unit Schlumberger Wire Une Unit Meihey Verco Iron Roughneck Motion Compensator Model 25/600 with

rated hook load capacity of 600,000 lbs.

RIG EQUIPMENT Cranes: Two Unk Belt FMC 1500.120' boom, 30 tons st 30 ft. One Unk Belt FMC 1500,80' boom, 62 tons st 20 ft. MoorlnQ System: Four double windlass units each with 800 hp DC

motors and incorporating a tension monitoring snd recording Indicating system.

Each of the eight 40,000 lb. LWT anchors is attached by 5,500 ft. of 3" SORQ, 1300 kip breaking strength chein

Propulsion Units: Two propellers in fixed kort nozzles (3000 hp per shaft) Crow Quarters: Air conditioned crew quarters for 90 men plua a six man

hospital Winterizing Equipment: Derrick floor shields; driller enclosure; derrickman

windbreak; steam or electric tracing for pipelines; de-icing fscilities; steam or electric heating for ail working space.

Dfving Ansa: Space for landing divers, for decompression chamber

and miscellaneous diving oquiprnent storage. Uleboala-Two fifty man Whittaker Capsules Four 25 man davit launched inflatable raftr Parts Warohouje: Space for full complement of equipment spent ports noiipon. Designed to accommodate 234 Chinook

EXHIBIT No

RIG STORAGE Upper Dock: Pipe Recks (6300 sq ft.) 2r260,0O0 lbs. Open Deck (4500 sq. ft.) 250 IbsTft. Main Deck: Open Deck (1,951 sq ft.) 250lbs.m\ Spider Deck (. ,951 sq ft.) 150 IbsTft. Weight Malarial and Cement: Bulk 12,000 cu. ft. Sack 6,000 sacks Liqutts^upper deck): Drilling Mud 1,750 barrels Fuel Oil 63 barrels Lube Oil 60 barrels Potat/'e Water 100 barrels Galley Supplies: Refhgereted 1,260 cu. tt. Dry Siorage 1,183 sq ft. Lesser Hulls: Drill Wster n^OObsnels Fuel Oil 7,800 bsrrels Potable Water 2.100 banels Ballast 56.000 barrels Caissons: Ballast 31,000 bsrrels

RIG DESCRIPTION Vessel Dimension!: Overall Length 260-5Vi " Beam Overall 217 Height, keel to top of main deck 116' Lower hulls (2)

Beam 53'4" Length of hull 260' Distance off center line to center of hull 75* Depth of Hull 25*

Caissons (6) Diameter on comers (4) 36' Diameter et midship (2) 36' Elevetion of top ebove keel 116' Overall trans, spcg. c-c 150' Overall long spcg cc 90'

Upper Structure Main deck length overall 231 -5Vi" Main deck beam overall (max.) 190 -7" Spider deck length 66'«6" Spider deck width 34"

Substructure Lengih 51'4T Width 40'

Desion Operating Conditions: Maximum Water Depth 1500* Minimum Water Depth 150' Draft—transit: 23'; drilling: 65'; survival: 50' Displacement—transit: 15,000 LT.. dniling: 25,400 LT.; survival: 22.500 LT Variable deck load (included 500 LT. bulk material in

caissons and 100 knot wind criteria)—transit: 3000 LT.; drilling: 2500 LT.; survival 3500 L.T.; (4000 ton capability using 70 knot wind critena)

Wind speed (one-min. ev.) 100 knots Wave height (maximum) 100 ft. Current Speed 3 knots Natural Periods:

Heave 19.4 19.4 Pitch 34.0 33.5 Roll 34.0 X.0

Design Loading Conditions: Mooring Load* Max service load-693,000 Ib. (proof) on eech of 6 moor­

ing lines.

Total Line Load: 2.544,000 lbs. Damage Stability: Barge meets one compartment standard of ABS for all

compartments in ail operating conditions. Barge meets two compartment caisson damage in all

operating conditions.

EXHIBIT No. 3D

UNION OIL AND GAS DIVISION UNION OIL CO OF C A L I F O R N I A - T E X A S O F F S H O R E D I S T R I C T

GARDEN BANKS BLK.4 04 PROSPECT

OC3-G 74S0 W.D.1900'

GARDEN BANK. AREA-OFFSHORE.TEXAS

VICINITY MAP IN • { • » • [ T»TlO* tn

DICK LANDRUM A* I .M. • A f t

9/45

MATE1>-BASE LIGNOSULFONATE HDD SYSTEM COMPETITIVE MUD PRODUCTS M V I SED 3/12/80

BAROID IMC MAGCOBAR MILCHEM DESCRIPTION

Baroid IMCO Bar

Weighting N o t o r i a l

Magcobar N i l - B a r B a r i t e (Barium S u l f a t e !

Aquagel Zeogel

loco Gol IBCO B r i n e g e l

loco Boat

C l a y ' V i a c o e l f l e r s )

Magcogel S a l t Gol

Super V i a b e a t O S

Nil-Gel Salt Mator Gal

Wyoming Bentonite A t t a p u l g i t e c l a y f o r

• a l t water muds. Asbestos Mate r i a l

Q-Broxin

Carbonox Sodium Chr< i t *

loco VC-10 iaco L i g S o d i - Ch ornate

Thinners

Speraene Tannathin Sodiua Chromate

Dnical Ligco Sod i um Chroaat a

Perrochrc Lignosulfonate

Chroae Lignosulfonate Processed L i g n i t e Sodium Chromate

(Chroo Additive for CLS Products)

C e l l e x Iaco-CMC

F l u i d L o s s C o n t r o l Agents

Magoo-CMC Milchom CMC Sodii i C a r b o x y a e t h y l -i l l u l o s e

U o a Caustic Soda

Uoa Caustic Soda

A l k a l i n i t y , B j C o n t r o l A d d i t i v e s

U o a Lime C a u s t i c Soda C a u s t i c Soda

Hydrated L i a e Sodiua Hydroxide

S . A . P . P .

Bi c a r bona t< of Soda

laco P l o a (8APF)

B i carbon*; t o of Soda

C a l c i u a Boaovors

S . A . P . P .

B i c a r b o n a t e of Soda

8 . A . P . P .

B i c a r b o n a t i o f Soda

lua Acid Pyrophosphate

Sodium B i c a r b o n a t e

A l u a i n u a S t e a r a t a

A lua inua S t e a r a t e

Daioaaor

Aluainua Stearate

Aluainua StearaK

Aluainua Stearate

Lost Circulation Materials

Micatex Imco Mica Magco Mica Mil Mica Mica Flakes (Graded) Mall But laco Plug But Plog Mil Plog Ground Walnut Bulls

(Graded)

wiscELLAMgoyg raooycTfi

TRADE MAMS COMPANY DESCRIPTION

CLS Drispac

Louisiana Nud Dr i l l i n g S p e c i a l t i e s , Inc.

Chroate Lignosulfonate - Thinner Polyanionic Cellulose - Fluid Loss Control

EXHIBIT 6 •

MUD QUANTITIES

On a l l Union O i l Company of C a l i f o r n i a d r i l l i n g operations from epud-in to p r o t e c t i o n pipe s e t t i n g , a a u f f i c i e n t q u a n t i t y of bulk weight material s h a l l be kept on loc a t i o n t o assure that the e n t i r e c i r c u l a t i n g system density can be increased by 0.5 ppg (minimum • 1500 sack .

When d r i l l i n g below protection pipe. Union w i l l attempt t o maintain a maximum storage on lo c a t i o n t o assure w e l l c o n t r o l . D r i l l i n g r i g s c u r r e n t l y employed by Union are l i s t e d below w i t h a corresponding bulk weight m a t e r i a l storage.

Rig Name Bulk Weight Storage (sacks)

G. A. IV, VI 4000 Blue Water IV 3000 See 15 3000 Marlin 5 3000

L i s t e d below are the minimum q u a n t i t i e s f o r mud chemicals t o be maintained on a l l Union d r i l l i n g l o c a t i o n s .

Chemical Quantity (sacke)

Gel 250 Caustic Soda 75 Chrome Lignosulfonate (LLS) 200 Lignite 100

I n the event of an emergency, mud supplies from Surfs ide, Texas can be obtained in 8 to 24 hours depending on r i g locations and ava i lab l i ty of aupply boats.

When using Baroid's Bnviromul the minimum quantit ies of mud chemical to be maintained on location are l i s t e d below.

Chemical

Mentor - 28 Invermul - NT E-Z Mul - NT Lime Duratone Geltone Calcium Chloride D r i l l t r e e t Petrotone

Quantity (sacks)

100 Barrels 28 (55 Gal. Drums) 28 (55 Gal. Drums) 200 aacka 150 aacka 200 aacka 300 aacka 30 (5 gal. cana) 50 aacka

EXHIBIT 6A

AIR QUALITY STATEMENT

The plan of operations for the d r i l l i n g of the exploratory wells for OCS-G-7499, Block 494, Garden Banks Area i s set out in the preceding pages.

I t i s expected to take approximately 150 days to d r i l l and complete the well. The r i g to be used to d r i l l these wells w i l l be a typical floater rig. The normal fuel consumption per day for this r i g i s approximately 1800 gallons of diesel. The onshore support base for t h i s a c t i v i t y w i l l be Union Oil Company of California shore base located at Surfside, Texas. A l l transportation, boats and helicopters, w i l l be handled from this base.

Air emission calculations are based on the aforementioned d r i l l i n g time frame and data from "Compilation of Air Pollutant Emission Factors", third edition AP-42, EPA, Tables 3.^.3-1 end 3.2.J-3. Any additional work required w i l l be minimal and result in air emissions well below the exemption le v e l .

EXHIBIV 7

YEAR: 1986 DAYS/YEAR: 150

EMISSION SOURCE

PROJECTED AIR EMISSION POR GARDEN BANKS 494

RUNNING TIME/DAY

TAKEOFFS & LANDINGS/DAY

Calculations for 150 Day D r i l l i n g Phase

Dr i l l i n g Rig 24 hrs.

Cargo Boat (In Berth)

Crew Boat (In Berth)

Helicopter

2 hrs.

2 hrs.

FUEL CONS GALS./DAY

1800

4

4

EMISSION FACTORS 4/1000 GALS.

SO NOx CO TSP VOC

31.2 469 102 33.5 37.5

31.2 469 102 33.5 37.5

31.2 469 102 33.5 37.5

.18 .57 .57 .25 .52

Projected Emission 150 Day Proj. in » Total in Pounds

SO NOx CO TSP VOC SO NOx CO TSP VOC

8424 126630 27540 9045 10125 Sub Total Pounds 8570 127534 28004 9235 10481

19 281 61 20 22 25% Factor 2142 31884 7001 2309 2620

19

ioe

281

342

61

342

20

150

22

312

Total Pounds

Total Tone

10712

5.36

159418

79.71

35005

17.50

11544

5.77

13101

6.55

Emission Rate (Lbs./Day) 71.4 1062.8 23J.4 76.9 87.3

EXHIBIT 7A Revised 10/85

LEASE/AREA: OCS-G-7499/Garden Banks BLOCK: 494

EXEMPTION CALCULATIONS

PLATFORM: Floater

E - 3400 (D ) for carbon monoxide

E « 33.3 D for sulfur dioxide, nitrogen to t a l suspended particulates v o l a t i l e organic compounds

oxides, , and

D - 128.8 Statute Miles (680,064 f t . )

E « 86728 CO

E - 4289 SO , NOx, TSP, and VOC

POLLUTANTS

1986 HIGHEST YEAR PROJECTED EMISSIONS

•E" (T/YR.) (T/YR.) EXEMPT

(YES OR NO)

SO 4289 5.36 YES

NOx 4289 79.71 YES

CO 86728 17.50 YES

TSP 4289 5.77 YES

VOC 4289 6.55 YES

E • The emission exemption amount expressed in tons per year.

D * The distance of the fa c i l i t y from the closest onshore area of a state expreased in statute miles.

EXHIBIT 7B Revised 10/85